Chimney-cowl



J. T. WAIT. CHIMNEY COWL. APPLICATION FILED SEPT.23, 1920.

Patented Nov. 23, 1920.

one

.i ATENT OFFICE.

JOHN T. WAIT, 0F INDIANAPOLIS, IYLVDIAITSI'Aa CHIMNEY-COWL.

To all whom it may concern:

Be it known that 1, JOHN T. WAIT, a citizen of the United States, residing at indianapolis, in the county of Marion and State of Indiana, have invented new and useful improvements in Chimney-Cowls, of which the following is a specification.

This invention relates to improvements in wind deflectors or cowls for the chimneys oi houses, particularly dwelling); houses, where an adjacent roof or wall interferes with the draft by creating air currents that blow over and down the chimney in a mannor to cause the issue of smoke into the rooms of the house of which the chimney is a part.

The object of this invention is to provide a simple and inexpensive wind-brake that protects the tine-opening and converts the otherwise objectionable currents of air into ones that will induce a partial vacuum and improve the draft.

l accomplish the above and other objects which will hereinafter appear, by the means illustrated in the accompanying drawing, in which Figure 1, is the sheet-metal lay-out ready for bending into the finished forms shown in the other figures of the drawing", along the dotted lines. Fig. 2, is a rear view, and Fig. 3, a top plan view of the finished article in operative position on a chimney, and Fig. 4- is a view in side elevation oifa house-roof and chimneys in which the chimneys are provided with my invention, tiis view illustrating the obstructions adjacent to the chimneys which would otherwise in teriere with the draft through the chimneys.

Like characters of reference indicate like parts in the several views of the drawing.

invention is made of sheet'metal of substantially diamond shape cut out in the flat, as shown in Fig. 1. It has a split 5 extending from one corner, in to what will be the base-line of a hood in the form of a hollow half-pyramid 6, when the metal sheet is bent on the dotted line (t o, and then on the lines (is-b, and aZ. The plates 7 and 8 will then lie in the same plane, and are adapted to rest upon the horizontal top of the chimney when in use. The corners are bent in opposite direction from hood 6, on the lines e-e, f-g, f-ii, and 2' 2', respectively to form ears 10, lapping the outside of the chimney and extending past the first mortar-joint below the top course of Specification of Letters Patent.

Patented Nov. 23, 1920.

1920. Serial No. 412,265.

bricks, and are retained on the chimney, thereby holding the cowl in place, by nails 9, driven through the cars into the mortarjoints under said ears.

The hood is applied with the closed side of the half-pyramid toward the roof or wall from whence the disturbing air currents originate, in the manner shown in Fig. The oblique sides of the member 6, and the outward slope of it as a whole, divides the interfering aircurrents and deflects them upwardly and laterally of the flue-opening in a manner to embrace and frictionally contact the smolrevapors issuing, from the chimney and drag? them outwardly and away from the flue-opening. This creates a partial vacuum in the latter which draws the waste products of combustion up from below by their rising; to fill it, and there upon these in turn are carried away in the manner above described.

The device is very inexpensive to make, the shape of it makes it nest closely for shipment in quantities, and it is readily and easily applied by anyone who can climb to the top of a chimney and drive four nails.

Commercially, the blank as shown in Fig. 1. may be more conveniently sold and shipped in that form to be bent into the finished product by any local tin or sheet metal worker.

Having thus fully described my invention, what I claim as new and wish to secure by Letters Patent ot' the United States, is

1. A blank for chimney-cowls formed out of'sheet metal in diamond shape with a split extending from one corner part way to the corner opposite.

2. A chimney cowl termed out of sheet metal bent to term a semi-pyramid with outside flanges at the base of the pyramid and ears depending from the flanges.

23. A chimney cowl formed out of sheet metal bent into a semi-pyramid, and also bent to provide outside flanges at the base of the pyramid coextensive with each pyramid side, said flanges being separated from each other opposite the angle between the two sides to form additional corners, there thus being two corners for each flange, all of said corners being bent down to form ears that contact the outside of the chimney when the cowl is in use. and means for fastening; the ears to the chimney.

signed at Indianapolis, Indiana, this the 1.3 day of Sept. 1920.

JOHN T. WAIT. 

